69 lines
2.5 KiB
Markdown
69 lines
2.5 KiB
Markdown
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# Toposort [](https://travis-ci.org/gustavohenke/toposort) [](https://gemnasium.com/gustavohenke/toposort)
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__Sorting directed acyclic graphs, for Node.js and the browser__
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_This was originally done by Marcel Klehr. [Why not checkout his original repo?](https://github.com/marcelklehr/toposort)_
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## Installation
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There are a few ways for installing Toposort. Here are them:
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* Via NPM: `npm install toposort-class`
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* Via Bower: `bower install toposort`
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* Via Git: `git clone git://github.com/gustavohenke/toposort.git`
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* [Direct download](https://raw.github.com/gustavohenke/toposort/master/toposort.js) for use in the browser
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## Example
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Let's say you have the following dependency graph:
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* Plugin depends on Backbone and jQuery UI Button;
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* Backbone depends on jQuery and Underscore;
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* jQuery UI Button depends on jQuery UI Core and jQuery UI Widget;
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* jQuery UI Widget and jQuery UI Core depend on jQuery;
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* jQuery and Underscore don't depend on anyone.
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Now, how would you sort this in a way that each asset will be correctly placed? You'll probably need the following sorting:
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* `jQuery`, `jQuery UI Core`, `jQuery UI Widget`, `jQuery UI Button`, `Underscore`, `Backbone`, `Plugin`
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You can achieve it with the following code, using `toposort-class`:
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```javascript
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var Toposort = require('toposort-class'),
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t = new Toposort();
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t.add("jquery-ui-core", "jquery")
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.add("jquery-ui-widget", "jquery")
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.add("jquery-ui-button", ["jquery-ui-core", "jquery-ui-widget"])
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.add("plugin", ["backbone", "jquery-ui-button"])
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.add("backbone", ["underscore", "jquery"]);
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console.log(t.sort().reverse());
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/* Will output:
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* ['jquery', 'jquery-ui-core', 'jquery-ui-widget', 'jquery-ui-button', 'underscore', 'backbone', 'plugin']
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*
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* And you're done.
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*/
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```
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## API
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First of all:
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```javascript
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var Toposort = require('toposort-class'),
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t = new Toposort();
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// If you prefer, you can do this way also:
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t = new require('toposort-class').Toposort();
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```
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### .add(item, deps)
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* _{String}_ `item` - The name of the dependent item that is being added
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* _{Array|String}_ `deps` - A dependency or list of dependencies of `item`
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__Returns:__ _{Toposort}_ The Toposort instance, for chaining.
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### .sort()
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__Returns:__ _{Array}_ The list of dependencies topologically sorted.
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This method will check for cyclic dependencies, like "A is dependent of A".
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## Legal
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MIT License
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